Timely warning of oil reservoir development dynamics is an effective way to improve the level of reservoir development and ensure the controlled operation of oilfield development. But the dynamic change of oil reservoir is fast and the influencing factors are complex.Present warning is mainly based on single production index such as oil well production and moisture content, which consideration is single and partial. The warning results can not fully reflect the development situation of the oil reservoir. In view of this problem, the evaluation is primarily based on the magnitude of change in the development level assessment score, supplemented by the natural decline rate and the absolute value of the water cut rise rate, comprehensive evaluation index of oil reservoir warning is introduced creatively. For oil reservoirs with deteriorating development conditions, dynamic warning of development is carried out by setting the reasonable range of change for key indicators on the basis of systematic evaluation of oil reservoir development level, And then, according to the warning results, timely and effective governance measures will be taken, and targeted adjustment measures will be formulated, in order to achieve “early prevention, early detection, effective control”, which has a great significance to improve the oilfield development effect and increase the final recovery rate of the oilfield.